声学超表面的非对称声分束特性研究

人工晶体学报 ›› 2021, Vol. 50 ›› Issue (7): 1362-1370.

声学超表面的非对称声分束特性研究

宋爱玲¹, 孙超彧¹, 陈天宁², 项延训¹, 轩福贞¹

1.华东理工大学机械与动力工程学院,上海 200237;
2.西安交通大学机械工程学院,西安 710049

收稿日期:2021-04-12 出版日期:2021-07-15 发布日期:2021-08-16
通讯作者: 项延训,博士,教授。E-mail:yxxiang@ecust.edu.cn
作者简介:宋爱玲(1992—),女,山东省人,博士,讲师。E-mail:ailingsong@ecust.edu.cn
基金资助:
国家自然科学基金NSAF国家安全联合基金重点项目(U1930202);近代声学教育部重点实验室开放课题研究基金

Asymmetric Beam Splitting of Acoustic Metasurface

SONG Ailing¹, SUN Chaoyu¹, CHEN Tianning², XIANG Yanxun¹, XUAN Fuzhen¹

1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Received:2021-04-12 Online:2021-07-15 Published:2021-08-16

摘要/Abstract

摘要： 非对称声分束超表面是由人工微单元结构按照特定序列构建的二维平面结构,可将垂直入射的声波分成两束传播方向和分束比自由调控的透射波,在声功能器件设计及声通信领域具有广泛的应用前景。本文系统研究了一种实现非对称声分束的设计理论和实现方法,基于局域声功率守恒条件研究了声分束器的设计理论、阻抗矩阵分布、法向声强分布、声压场分布等。利用遗传算法对四串联共振腔结构进行参数优化实现了声分束器所需的阻抗矩阵分布,声压场分布表明声波入射到声分束器后在入射侧激发出两列传播方向相反且幅值和衰减系数均相同的表面波,实现了入射侧与透射侧的局域声功率相互匹配。声波经过声分束器后被分为两束透射波,两束透射波的折射角和透射系数与理论值十分吻合,证明了设计理论及实现方法的正确性和可行性。本文的研究工作可以为新型非对称声分束结构设计提供理论参考、设计方法和技术支持,并促进其在工程领域的实际应用。

关键词: 非对称声分束, 声学超表面, 局域声功率, 阻抗矩阵, 共振腔

Abstract: Asymmetric beam splitting metasurface is a two-dimensional planar structure constructed by artificial micro-unit structures in a specific sequence, which can split the normally incident wave into two transmitted beams with freely modulated propagation direction and splitting ratio. It has broad application prospects in acoustic function device design and acoustic communication field. In this paper, the design theory and implementation method for realizing asymmetric beam splitting were systematically studied. Based on the local power conservation condition, the design theory, the impedance matrix distribution, the normal intensity distribution, and the sound pressure field distribution were investigated. The parameters of four-resonator structures are optimized by Genetic algorithm to realize the required impedance matrix distribution. The sound pressure fields indicate that the surface waves with same amplitude, same attenuation coefficients, and opposite propagation directions are excited at the incident side to match the incident and transmitted local power. The transmitted waves are divided into two beams, the refracted angles and transmission coefficients are in good agreement with the theoretical values, which demonstrate the correctness and feasibility of the design theory and realization method. The research results can provide theoretical references, design methods, and technical support for new asymmetric beam splitting device design, and promote their potential engineering applications.

Key words: asymmetric beam splitting, acoustic metasurface, local power, impedance matrix, resonator

中图分类号:

O422
O424

宋爱玲, 孙超彧, 陈天宁, 项延训, 轩福贞. 声学超表面的非对称声分束特性研究[J]. 人工晶体学报, 2021, 50(7): 1362-1370.

SONG Ailing, SUN Chaoyu, CHEN Tianning, XIANG Yanxun, XUAN Fuzhen. Asymmetric Beam Splitting of Acoustic Metasurface[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(7): 1362-1370.

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